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本文介绍并分析在铜九铁路初测中，应用ｗｉｌｄ２００ＧＰＳ接收机对６３ｋｍ的航测外控点的高程试验的情况，结果表明：只要用ＧＰＳ联测少量线路初测水准点，用适当的方法拟合求得的ＧＰＳ外控点的正常高，精度完全能满足１／２０００或更小比例尺航测成图的需要。
This paper introduces and analyzes the elevation test of the external control point of 63km surveyed by wild200GPS receiver in the preliminary test of Tongjiu Railway. The results show that as long as the initial test leveling point of a few lines is measured by GPS, the appropriate method is used to fit The obtained GPS external control points are of high normality and precision, which can meet the needs of aerial mapping of 1/2000 scale or smaller.